U.S. patent application number 13/701323 was filed with the patent office on 2013-03-21 for coil resonant coupler for short distance wireless power communication and short distance wireless power transmitting apparatus including the same.
This patent application is currently assigned to Hanrim Postech Co., Ltd. The applicant listed for this patent is Yoon-Sang Kuk. Invention is credited to Yoon-Sang Kuk.
Application Number | 20130069587 13/701323 |
Document ID | / |
Family ID | 46172080 |
Filed Date | 2013-03-21 |
United States Patent
Application |
20130069587 |
Kind Code |
A1 |
Kuk; Yoon-Sang |
March 21, 2013 |
COIL RESONANT COUPLER FOR SHORT DISTANCE WIRELESS POWER
COMMUNICATION AND SHORT DISTANCE WIRELESS POWER TRANSMITTING
APPARATUS INCLUDING THE SAME
Abstract
Disclosed herein are a coil resonant coupler for short distance
wireless power communication and a short distance wireless power
transmitting apparatus comprising the same. The coil resonant
coupler for short distance wireless power communication comprises a
first coil installed perpendicularly to a first axis; a second coil
installed perpendicularly to a second axis perpendicular to the
first axis; and a third coil installed perpendicularly to a third
axis perpendicular to each of the first and second axes. The short
distance wireless power transmitting apparatus comprises a primary
side core comprising the above-described coil resonant coupler, a
position sensing unit which senses a position of the wireless power
receiving apparatus to generate position information, and a
transmission controlling unit which controls the primary side core
based on the position information.
Inventors: |
Kuk; Yoon-Sang; (Seoul,
KR) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Kuk; Yoon-Sang |
Seoul |
|
KR |
|
|
Assignee: |
Hanrim Postech Co., Ltd
Suwon-si, Gyeonngi-do
KR
|
Family ID: |
46172080 |
Appl. No.: |
13/701323 |
Filed: |
January 7, 2011 |
PCT Filed: |
January 7, 2011 |
PCT NO: |
PCT/KR2011/000128 |
371 Date: |
December 5, 2012 |
Current U.S.
Class: |
320/108 |
Current CPC
Class: |
H02J 50/90 20160201;
H02J 7/025 20130101; H02J 7/00 20130101; H02J 50/70 20160201; H02J
50/80 20160201; H02J 50/12 20160201; H02J 5/005 20130101; H02J
50/40 20160201 |
Class at
Publication: |
320/108 |
International
Class: |
H02J 7/00 20060101
H02J007/00 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 30, 2010 |
KR |
1020100120330 |
Claims
1. A coil resonant coupler for short distance wireless power
communication, comprising: a first coil installed perpendicularly
to a first axis; a second coil installed perpendicularly to a
second axis perpendicular to the first axis; and a third coil
installed perpendicularly to a third axis perpendicular to each of
the first and second axes.
2. The coil resonant coupler of claim 1, wherein the first to third
coils are annular coils having the same shape.
3. The coil resonant coupler of claim 2, further comprising a
magnetic focusing plate formed on the same plane as that of the
first coil and installed at an inner side of the first coil.
4. The coil resonant coupler of claim 3, wherein the magnetic
focusing plate comprises ferrite.
5. The coil resonant coupler of claim 3, wherein the magnetic
focusing plate has a meta-material structure.
6. The coil resonant coupler of claim 2, wherein cross sections of
the first to third coils have a square shape, a circular shape, or
an oval shape.
7. A short distance wireless power transmitting apparatus,
comprising: a primary side core comprising the coil resonant
coupler for short distance wireless power communication of claim 1;
a position sensing unit which senses a position of the wireless
power receiving apparatus to generate position information; and a
transmission controlling unit which controls the primary side core
based on the position information received from the position
sensing unit.
8. The short distance wireless power transmitting apparatus of
claim 7, wherein the transmission controlling unit controls a
decoupling of least one of the first to third coils based on a
position vector information of the position information.
9. The short distance wireless power transmitting apparatus of
claim 7, wherein the transmission controlling unit controls a
generation of power signal with respect to at least one of the
first to third coils based on the position vector information of
the position information.
10. The short distance wireless power transmitting apparatus of
claim 7, wherein the position sensing unit generates a pulse signal
through one or more of the first to third coils, receives a
response signal to the pulse signal through one or more of the
first to third coils, and analyzes the response signal to generate
the position information.
11. The short distance wireless power transmitting apparatus of
claim 7, wherein the position sensing unit is an ultrasonic sensor.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a national stage of PCT Application No.
PCT/KR2011/000128, filed Jan. 7, 2011, which claims the benefit of
Korean Application No. 10-2010-0120330, filed Nov. 30, 2010 in the
Korean Intellectual Property Office. The disclosures of these
applications are incorporated herein by reference.
BACKGROUND OF THE INVENTION
[0002] 1. Field of the Invention
[0003] The present invention relates to a coil resonant coupler for
short distance wireless power communication, and a short distance
wireless power transmitting apparatus comprising the same.
[0004] 2. Description of the Related Art
[0005] Generally, portable apparatuses such as cellular phones,
personal digital assistants (PDAs), portable multimedia players
(PMPs), digital multimedia broadcasting (DMB) terminals, MP3
players, or laptop computers may not use general household power,
such that the portable apparatuses are mounted with a one-time
battery or a rechargeable battery.
[0006] In a charger for charging the battery of the portable
apparatus with electricity, a terminal supplying scheme of
receiving the electricity from a general power supply and supplying
power to a battery pack of the battery through a power supplying
terminal is known in the related art. However, when the power is
supplied in the terminal supplying scheme, if the charger and the
battery are connected to or disconnected from each other, the
respective terminals may have different potential differences and
may generate an instantaneous discharge phenomenon. Therefore,
foreign materials which may have collected at the terminals create
a risk of a fire. In addition, self-discharge into the environment
due to moisture or the like may. deteriorate a lifespan and
performance of the charger and the battery.
[0007] In order to solve these problems in the terminal supplying
scheme, a contactless charger has been developed. In the
contactless charger according to the related art, when a terminal,
in which a battery to be charged is embedded, is positioned on a
primary coil of the contactless charger, the battery is charged
with electricity by a secondary coil of the battery. That is, the
secondary coil charges electricity of an electromotive force
induced by a magnetic field generated in the primarpy coil.
[0008] However, the contactless charger according to the related
art may charge the battery only if a wireless power receiving
apparatus is significantly close to the charger.
[0009] In order to solve this problem, short distance wireless
power communication systems have been developed. Among these short
distance wireless power communication systems, a magnetic resonance
type wireless power communication system in which less or more
directed electromagnetic waves are generated has been suggested, in
order to increase efficiency of power transmission.
SUMMARY OF THE INVENTION
[0010] While not limited thereto, an object of the present
invention is to provide a coil resonant coupler for short distance
wireless power communication capable of improving wireless power
transmission efficiency and allowing short distance wireless power
communication to be efficiently performed regardless of a direction
in which a short distance wireless power receiving apparatus is
present with respect to a short distance wireless power
transmitting apparatus, in magnetic resonance type short distance
wireless power communication, and a short distance wireless power
transmitting apparatus comprising the same.
[0011] While not limited thereto, according to an embodiment of the
present invention, a coil resonant coupler for short distance
wireless power communication may comprise a first coil installed
perpendicularly to a first axis; a second coil installed
perpendicularly to a second axis perpendicular to the first axis;
and a third coil installed perpendicularly to a third axis
perpendicular to each of the first and second axes.
[0012] According to an aspect of the invention, the first to third
coils may be annular coils having the same shape.
[0013] According to an aspect of the invention, the coil resonant
coupler for short distance wireless power communication may further
comprise a magnetic focusing plate formed on the same plane as that
of the first coil and installed at an inner side of the first
coil.
[0014] According to an aspect of the invention, the magnetic
focusing plate may comprise ferrite.
[0015] According to an aspect of the invention, the magnetic
focusing plate may have a meta-material structure.
[0016] According to aspects of the invention, cross sections of the
first to third coils may have a square shape, a circular shape, or
an oval shape.
[0017] While not limited thereto, according to another embodiment
of the invention, a short distance wireless power transmitting
apparatus may comprise a primary side core comprising the coil
resonant coupler for short distance wireless power communication as
described above; a position sensing unit which senses a position of
the wireless power receiving apparatus to generate position
information; and a transmission controlling unit which controls the
primary side core based on a position information received from the
position sensing unit.
[0018] According to an aspect of the invention, the transmission
controlling unit may control a generation of a power signal with
respect to at least one of the first to third coils based on the
position vector information of the position information.
[0019] According to an aspect of the invention, the transmission
controlling unit may control a decoupling of at least one of the
first to third coils based on the position vector information of
the position information.
[0020] According to an aspect of the invention, the position
sensing unit may generate a pulse signal through one or more of the
first to third coils, receive a response signal to the pulse signal
through one or more of the first to third coils, and analyze the
response signal to generate the position information.
[0021] According to an aspect of the invention, the position
sensing unit may be an ultrasonic sensor.
[0022] An advantage of the embodiment of the present invention
having the above-mentioned configuration is that, using the
magnetic resonance type short distance wireless power
communication, the wireless power may be received even though the
wireless power receiving apparatus may be located in any direction
relative to the wireless power transmitting apparatus.
[0023] An additional advantage of the embodiment of the present
invention having the above-mentioned configuration is that, using
the magnetic resonance type short distance wireless power
communication, the transmission efficiency may be improved.
[0024] Additional aspects and/or advantages of the invention will
be set forth in part in the description which follows and, in part,
will be obvious from the description, or may be learned by practice
of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] These and/or other aspects and advantages of the invention
will become apparent and more readily appreciated from the
following description of the embodiments, taken in conjunction with
the accompanying drawings of which:
[0026] FIG. 1 is a conceptual diagram of a magnetic resonance type
wireless power charging system, according to one embodiment of the
present invention;
[0027] FIG. 2 is a schematic block diagram of a magnetic resonance
type wireless power charging apparatus, according to one embodiment
of the present invention;
[0028] FIG. 3 is a detailed block diagram of the magnetic resonance
type wireless power charging apparatus, according to the embodiment
of the present invention expressed in FIG. 2;
[0029] and
[0030] FIG. 4 is a perspective view of a coil resonant coupler
forming a primary side core of the magnetic resonance type wireless
power charging apparatus according to the embodiment of the present
invention expressed in FIG. 2.
DETAILED DESCRIPTION OF THE EMBODIMENTS
[0031] Reference will now be made in detail to the present
embodiments of the present invention, examples of which are
illustrated in the accompanying drawings, wherein like reference
numerals refer to the like elements throughout. The embodiments are
described below in order to explain the present invention by
referring to the figures.
[0032] Hereinafter, a coil resonant coupler for short distance
wireless power communication and a short distance wireless power
transmitting apparatus comprising the same according to an
exemplary embodiment of the present invention will be described in
detail with reference to the accompanying drawings. In the present
specification, throughout the exemplary embodiments of the present
invention, similar components will be denoted by the same or
similar reference numerals and a description thereof will be
replaced by a first description.
[0033] First, a short distance wireless power communication system
will be briefly described with reference to FIG. 1.
[0034] FIG. 1 is a conceptual diagram of a magnetic resonance type
wireless power charging system according to one embodiment of the
present invention. As shown in FIG. 1, the magnetic resonance type
wireless power charging system may comprise a wireless power
transmitting apparatus A, which is a charger, and a wireless power
receiving apparatus B.
[0035] Resonance is a phenomenon where, when a vibration system
periodically receives external force having the same frequency as a
natural frequency thereof, an amplitude thereof is clearly
increased. In the case of electrical resonance, the resonance may
be caused by electrical vibration as well as dynamical vibration;
when a plurality of vibration bodies spaced apart from each other
by a predetermined distance vibrate at the same frequency as each
other, the plurality of vibration bodies vibrate at a greater
amplitude. In such case, resistance between the plurality of
vibration bodies is decreased.
[0036] A power signal is transmitted to the wireless power
receiving apparatus B through a resonance signal by an electric
field or a magnetic field generated in a primary side core of the
wireless power transmitting apparatus A, using the electrical
resonance principle described above, and the wireless power
receiving apparatus B receiving the power signal serves as a power
supplying unit rectifying the power signal to charge the battery or
operate other connected electronic devices.
[0037] Hereinafter, a wireless power charging apparatus in the
magnetic resonance type wireless power system as described above
will be described in detail with reference to FIGS. 2 and 3.
[0038] FIG. 2 is a schematic block diagram of a magnetic resonance
type wireless power charging apparatus according to one embodiment
of the present invention. As shown in FIG. 2, the magnetic
resonance type wireless power charging apparatus may be configured
to comprise a transmission controlling unit 20, a primary side core
30, and a position sensing unit 40.
[0039] The primary side core 30, which generates a resonance signal
under a control of the transmission controlling unit 20, may
comprise a resonant coupler comprising three coils. The resonant
coupler will be described in more detail in FIG. 4.
[0040] In the shown embodiment, the position sensing unit 40 is a
device sensing a position of the wireless power receiving apparatus
B and generating position information reflecting the position. In
some embodiments, the position sensing unit 40 may be an ultrasonic
sensor and may receive a response signal corresponding to a pulse
signal, and may generate the position information using a phase
change or a delay time of the response signal when the pulse signal
is generated through the resonant coupler. That is, the position
sensing unit 40 may generate the pulse signal through one or more
of the first to third coils, receive the response signal to the
pulse signal through one or more of the first to third coils, and
analyze the response signal, thereby generating the position
information.
[0041] In the shown embodiment, the transmission controlling unit
20 controls the primary side core 30 based on the position
information received from the position sensing unit 40. More
specifically, the transmission controlling unit 20 control a
generation of a power signal with respect to at least one of the
first to third coils comprised in the resonant coupler based on
position vector information of the position information. That is,
when the power signal is generated with respect to at least one of
the first to third coils based on the position vector information
comprised in the position information, the transmission controlling
unit 20 may better control the generation of magnetic resonance by
forming a magnetic field in the direction of the wireless power
receiving apparatus B. That is, the vector information comprises X
axis, Y axis, and Z axis information, and the transmission
controlling unit 20 controls a synthesis of magnetic fields,
generated in coils (the first to third coils 110 to 130)
corresponding to each axis, to form a magnetic field corresponding
to the vector information. In some embodiments, the transmission
controlling unit 20 may control a decoupling of at least one of the
first to third coils based on the position vector information
comprised in the position information.
[0042] Hereinafter, a configuration of the magnetic resonance type
wireless power charging apparatus will be described in more detail
with reference to FIG. 3.
[0043] FIG. 3 is a detailed block diagram of the magnetic resonance
type wireless power charging apparatus of FIG. 2.
[0044] As shown in FIG. 3, according to one embodiment of the
present invention, the transmission controlling unit 20 of the
wireless power charging apparatus B may be configured to comprise a
main controller 21, an output signal converting module 22, a
resonant converter 23, and a receiving signal processing module
24.
[0045] In the shown embodiment, the main controller 21 serves to
receive and confirm the position information generated in the
position sensing unit 40 and control the output signal converting
module 22 and the resonant converter 23 in order to transmit the
resonant power signal to the primary side core 30. That is, the
main controller 21 determines the power signal that is to be
transmitted based on a response signal processed in the receiving
signal processing module 24 and controls the output signal
converting module 22 accordingly, thereby allowing the resonant
power signal according to the response signal to be transmitted to
the primary side core 30 through the resonant converter.
[0046] In the shown embodiment, the output signal converting module
22 serves to control a resonant converter 23, to be described
below, based on the control signal of the main controller 21.
[0047] In the shown embodiment, the resonant converter 23 generates
transmission power for generating the power signal that is to be
transmitted under a control of the output signal converting module
22, and supplies the generated transmission power to the primary
side core 30. In other words, when the main controller 21 transmits
a power control signal for transmitting a power signal having a
required power value to the output signal converting module 22, the
output signal converting module 22 controls an operation of the
resonant converter 23, corresponding to the transmitted power
control signal, and the resonant converter 23 applies transmission
power corresponding to a required power value to the primary side
core 30 by the control of the output signal converting module 22,
thereby allowing a resonant wireless power signal having required
strength to be transmitted.
[0048] In addition, the resonant converter 23 may also, under the
control of the output signal converting module 22, supply power
initially through the primary side core 30 in order to generate a
pulse signal which detects a position of the wireless power
receiving apparatus B.
[0049] In the shown embodiment, the receiving signal processing
module 24 is a module which processes a receiving signal
transmitted from the wireless power receiving apparatus B. That is,
the receiving signal processing module 24 receives the response
signal to the pulse signal, in order to confirm a type of wireless
power receiving apparatus B. Then, the receiving signal processing
module 24 receives and processes a charged state signal from the
wireless power receiving signal during transmission of the resonant
wireless power signal. Therefore, the main controller 21 controls
the output signal converting module 22 to control the output
resonant power signal.
[0050] Hereinafter, a structure of a coil resonant coupler used in
the primary side core of the magnetic resonance type wireless power
charging apparatus having the above-mentioned configuration will be
described in detail with reference to FIG. 4.
[0051] FIG. 4 is a perspective view of a coil resonant coupler,
which is a primary side core of the magnetic resonance type
wireless power charging apparatus of FIG. 2. According to one
embodiment of the present invention shown in FIG. 4, the coil
resonant coupler may be configured to comprise a first coil 110
installed perpendicularly to a first axis, a second coil 120
installed perpendicularly to a second axis perpendicular to the
first axis, a third coil 130 installed perpendicularly to a third
axis perpendicular to each of the first and second axes, a disk
shaped magnetic focusing plate 140 based on the central axes of
these coils, and a fixing bar 150 fixing the magnetic focusing
plate 140 to the second coil 120. As shown in FIG. 4, the first to
third coils 110 to 130, which are annular coils having the same
shape, generate magnetic fluxes in the X axis, the Y axis, and the
Z axis, respectively. The resonant power signal is transmitted to
the wireless power receiving apparatus B through a synthetic
magnetic field of the first to third coils 110 to 130.
[0052] In the shown embodiment, the magnetic focusing plate 140,
which serves to increase power signal transmission efficiency, may
comprise ferrite. The ferrite is a solid solution formed by melting
alloy elements or impurities in iron having body-centered cubic
crystal stable at a temperature of 900.degree. C. or less. The
ferrite, which is a metallographic term for steel, is a solid
solution based on a iron, such that it has the same appearance as
that of pure iron. However, the ferrite may also be called silicon
ferrite or ferrosilicon according to a name of a solved element.
When viewed under a microscope, the ferrite has a single crystal.
In addition, a mixture of a white portion in which carbon is
slightly dissolved and a black portion appears in the ferrite.
Since the ferrite has high permeability in a range of a low
frequency to several hundreds of MHz, it serves to improve power
transmission efficiency in the magnetic resonance type short
distance power transmission.
[0053] The magnetic focusing plate 140 may have a meta-material
structure. The meta-material corresponding to a material having
electromagnetic characteristics, which is not present in a general
natural state, generated by an artificial method is a material
having a negative refractive index. A unique point of the
meta-material is that it has a negative refractive index, such the
light is refracted in an opposite direction to a direction in which
it is refracted in a general material. Since the meta-material has
the negative refractive index, it may focus a magnetic field to
improve transmission efficiency. As shown in FIG. 4, the magnetic
focusing plate 140 may be disposed on the same plate as that of the
first coil 110.
[0054] The fixing bar 150, which is a component for fixing the
magnetic focusing plate 140 to the second coil 120, may be made of
a non-conductive material that is not affected by the magnetic
field.
[0055] In various embodiments, a vertical cross section of the
first to third coils 110 to 130 having an annular shape may have a
square shape, a circular shape, or an oval shape.
[0056] According to the embodiment of the invention having the
above-mentioned configuration, using the magnetic resonance type
short distance wireless power communication, the wireless power may
be received even though the wireless power receiving apparatus B
may be located in any direction relative to the wireless power
transmitting apparatus A.
[0057] In addition, according to the same embodiment of the present
invention, using the magnetic resonance type short distance
wireless power communication, the transmission efficiency may be
improved.
[0058] Although a few embodiments of the present invention have
been shown and described, the coil resonant coupler for short
distance wireless power communication and the short distance
wireless power transmitting apparatus comprising the same as
described above are not limited to the configurations and the
operation schemes of the embodiments described above. It would be
appreciated by those skilled in the art that changes may be made in
this embodiment without departing from the principles and spirit of
the invention, the scope of which is defined in the claims and
their equivalents. The above-mentioned embodiments may also
variously modified through a selective combination of all or some
thereof.
* * * * *